Patent No. EP3801949 (titled "Sizing Composition, Method For Coating A Casting Mould And Use Of The Sizing Composition For Coating A Casting Mould") was filed by ASK Chemicals on May 15, 2019. The application was issued on Feb 14, 2024.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
| Company | Opposition Date | Representative |
|---|---|---|
| HUTTENES ALBERTUS CHEMISCHE WERKE GESELLSCHAFT MIT BESCHRANKTER HAFTUNG | Nov 14, 2024 | EISENFUHR SPEISER |
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